clark



N0 Model.) J H 4Shee'ns-Sheet 1.

ELEVATOR MECHANISM.

No. 573,809. Patented Dec. 22, 1896.

3 8 hawk (No Model.) 4 SheetsSheet 2.

J. H. CLARK ELEVATOR MECHANISM. No. 573,809.. Patented Dec, 22, 1896.

(NoModeL) 4 Sheets-Sheet 4. J. H. CLARK.

ELEVATOR MECHANISM.

Patented-Dec. 22, 1896.

UNITED STATES PATENT OFFICE.

JOHN H. CLARK, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE TVHITTIER MACHINE COMPANY, OF SAME PLACE.

ELEVATOR MECHANISM.

SPECIFICATION forming part of Letters Patent No. 57 3,809, dated December 22, 1896. Application filed July 28, 1890. Serial No. 360,162. (No model.)

To all whom, it Duty concern:

Be it known that I, JOHN H. CLARK, of Boston, county of Suifolk, State of Massachusetts, have invented an Improvement in Elevator Mechanism, of which the following description, in connection with the accompanying drawings,is a specification, like letters on the drawings representing like parts.

This invention relates to elevator mechanxo ism of that class in which an electric motor is used to furnish the power employed to actuate the elevator.

My invention consists in the features of construction and arrangement of parts having the mode of operation substantially as hereinafter set forth.

a e Figure 1 1s a slde elevation of one end of an elevator-operating mechanism embodying my invention; Fig. 2, a top or plan view of a portion of the elevator mechanism shown in Fig. 1, together with additional parts; Fig. 3, a side elevation of the other portion or end of the machine from that shown in Fig. 1, looking on the opposite side; and Fig. 4, a

2 5 diagram of circuits to more clearly illustrate the operation of the mechanism.

The electric motor A has its armature-shaft a supported by uprights a a and, as herein shown, connected to a worm-shaft a by an independent coupling, (shown as flanged hubs a 0. fast on the armature-shaft a and on the worm-shaft a respectively, the flanges a a of the said hubs being secured together, as by bolts a 5 The worm-shaft (0 as herein shown, has

bearings in a case or frame at, and is provided with two worms (L13 a, (represented by dotted lines, Fig. 3,) the said worms engaging worm-gears a a, mounted on shafts a" (L having bearings in the sides of the case co, the said worm-gears meshing with each other.

In practice one of the shafts a" a may have mounted upon it one or more drums (1 only one of which is shown in Fig. 3, upon which the hoisting cable or cables 0, may be wound to raise the elevator-ear, as in the ordinary drum-elevator, or the said shafts may be connected in suitable manner to drive a pump usually employed in the hydraulic-elevator system.

provided on its opposite side with a tooth b to engage a tooth b on a hub 19 fastened to the said shaft, as by a key If.

The gear I) meshes with a substantially wide gear I), loose on a stud Z7 herein shown as secured to the side of the case (L12, and the loose gear b" engages with a gear I) on a shaft b upon whlch is mounted, as herein shown,

the usual shipper wheel or pulley b.

The wheel and hub 19 provided with the teeth Z2 b the pinion Z), having the teeth b b and the gears Z2 constitute one form of automatic stop mechanism for the elevator mechanism.

The shaft Z1 as herein represented, is extended through a suitable sleeve or hub Z9 which is fast upon the said shaft, and which is provided at the opposite side of the machine (see Fig. 1) with a disk b eecentrically mounted on the shaft Z9 or upon a reduced portion thereof 0, the said eccentric disk being provided with an eccentric-strap I), to which is connected the movable member of a circuit-controlling device, preferably a polechanger, herein shown as consistingof terminal plates or brushes b I) Z9 secured to a suitable base I9 preferably of insulating material.

The terminal plates or brushes have cooperating with them two contact bars or brushes W 19 herein shown as secured to a 0 bar or rod 11 f of insulating material, pivoted at 11 to a projection or stud on the eccentricstrap 6 the said contact-brushes, as herein represented, being secured at their rear end to bars Z9 Z9, pivoted to the base I9 The reduced portion 0 of the shaft Z9 on which the eccentric disk b is mounted, has

a crank'or arm 0, to which is pivoted, as herein shown, a rod 0 provided at its lower end with a rack-bar 0 having secured to or :00

forming part of it, as herein shown, a bar 0 provided with a slot into which is extended the shaft c of a pinion c in mesh with said rack-bar, and which is rotated by the mevement of the rack-bar, produced by the revolution of the shaft 0, the bar c in its movement tipping or rocking on the shaft 0 The shaft c of the pinion c has mounted on it one end of an arm or lever a having secured to or forming part of its opposite end a contact-brush c, ili'orming one member of a switch, the cooperating member of which consists of a series of resistances c, arranged. in the arc of a circle and supported by a suitable frame 0".

The lever c in practice has connected to it a wire (see laig. 1,) joined to one commntator-ln'ush, as u, of the electric motor A, and the lowest resistance of the series of re sistances c has connected to it awire 0". (See Fig. l.)

The sleeve or hub 11 has secured to or :l'orming part of it, as herein shown, an annular ring I (see Fig. 2,) provided with a lug or car 11", adapted to be brought into engagement with a lug or projection Zr" on the side of the case a by a partial rotation of the shaft h and the sleeve b, fast thereon. The lug U when brought into engagement with the stud Z 32 by the partial rotation. of the shaft h in one direction, as indicated. by arrow 50, Fig. 2, stops the rotation of the said shaft in that direction and thereby limits the movement of the rack-bar c in the direction indicated by arrow std, Fig. l, the contactbrush cat such time being disengaged from the resistances c" and the circuit of the electrio motor being broken. \Vhen the lug If" is brought into engagement with the stud If in the partial rotation of the shaft 7) in the direction opposite to that indicated by arrow 50, the said shaft is stopped in its rotation, the contact-brush c being atsuch time in engagement with the lowest resistance c, and the motor is being run with a maximum amount of current.

The elevator mechanism herein shown is provided with an electric brake mechanism consisting of a brake-wheel (7, herein shown as mounted on the hub a", the said brakewheel being encircled by a brake-strap it, having its ends secured in suitable manner to a hub (Z fast on aroek-shal't (1, having suitable hearings in the framework of the machine, the said hub having secured to or forming part of it a lever d", which in practice is provided with a counterbalancingweight (Z (See Fig. 1.) The rock-shaft d has also fast upon it, as herein shown, a hub d, having an arm (Z to which is secured a link (1, fastened, as by a pin (1, to a bar (1 havingsecured to or forming part of it cores (Z of a solenoid (1 which may be of any usual or well-known construction, the said solenoid having one of its wires, as d, connected to the connnutator-brush a and its other wire (Z joined to the terminal 71 of the pole-changer, as shown in Fig. 4-.

The brake-strap (Z is secured to the hub (Z in such manner that when the solenoid d is energized and its cores cl are attracted within it the rock-shaft d is turned so as to release the brake-strap from the brake-wheel (Z and permit of the free rotation oi. the said brakewheel; but when the circuit of the solenoid d is broken the eounterbahmcing-weight d will turn the rock-shaft (75, so as to cause the brakestrap to bind upon the brake-wheel (Z and hold it stationary, thereby preventing rotation of the worm-shaft and oi. the armature-sha'ft of the motor.

Referring to Fig. i, the pole I) of the polechanger is connected by wire (2 to the pole U The contact brush or arm I) of the polechanger has connected to it one wire 0" olf the armature-circuit of the motor, which wire is shown in Fig. l as being connected to the negative line-wire c and the other contactarm b of the pole-changer has connected to it the other wire 01 the armaturecircuit, which wire in turn is connected with the positive line-wire c, the said positive and negative line-wires being connected to the holdmagnet ot' the electric motor. The resistance device c is in the armature-cireuit, and its lower end is joined to the terminal U of the pole-changer by the wires c".

In operation the elevator mechanism is started when the contact: brush 0* on the switch-lever c is brought in to contact with the first oil the resistances c. This maybe accomplishcd by turning the shipper-whecl b by means of the usual shipper-rope opera'ited from the car, or by any other usual or well-- known form of starting and stopping mechanism operated from the said car. 'Ythcn the shipper-wheel h is rotated so as to bring the contact-brush c in contact with the resistances c", the pole-changing arms if U are brought in contact with the poles I) h and. the circuit of the electric motor completed, which circuit may be traced as follows, viz: through. the positive wire (2%", lield-nntgnets, to the negative wire c thus completing the circuit through the field-magnets of the motor. A portion oi the current flows from the positive wire a, wire c, contaet brush b terminal I), wire it, solenoid-coils (Z- wire (2, comrmitator-brush (1, armature ol' the motor, brush a, wire 0', lever c resistances c", wire c terminal U wire 6, terminal Z), brush If, and wire c" to negativewire 0 The rotation of the armature-shat t and ot' the worm-shaft is auton'iatica-lly stopped, as described, when the lug U is brought into on gagement with the stud U, which occurs when one of the teeth b b onthe gear or pinion Z) engages with one of the projections 11* Z)", the shaft b being given a partial .rotation suiliicient to disengage the pole-changing arms U U from its cooperating poles, but it it is desired to stop the elevator positively by hand the operator may move the shipper-wheel I) in the direction opposite to that indicated by arrow 20, Fig. 1, and thus move the rack-bar c .in the direction of arrow 4.0 to cause the 'IlO pinion c to rotate and move the switch-lever 0 back, and thus withdraw the contact-brush c from engagement with the resistances c.

If it is desired to rotate the armature of the electric motor in the direction opposite to that in which it is rotated when the contact-arms b 1) of the pole-changer are in contact with the poles Z2 b the shipper mechanism is rotated in the direction opposite to that indicated by arrow 20 until the contact-arms Z2 N of the pole-changer are brought in contact with the poles Z2 Z1 at which time the circuit of the electric motor is completed at the polechanger and through the resistances, the circuit through the field-magnets of the motor being the same as described, and the circuit through the armature being as follows, viz: wire 6 contact-arm Z9 pole b wire 0 resistances c", lever a", wire e commutatorbrush a, armature, commutator brush a wire c1 coils (Z of solenoid, wire (Z pole b contact-arm F2 and wire 6 It will be thus seen that the motor A is a shunt-motor and that the resistance device and the pole-char: ger are located in the armature-circuit of the motor. This arrangement is of great advantage and importance in an elevator apparatus, because thereby it is possible to run the elevator-car at all times at a uniform speed, whether running up or down and with or without a load.

In order that the shaft 11 may be rotated in opposite directions to automatically break or open the circuit of the motor and thus stop the elevator when it has reached the limit of its travel in either direction, the gear Z) is provided with the teeth 12 b to engage the teeth Z2 Z1.

\Vhen the tooth b engages the tooth Z), the shaft b is rotated in the direction of arrow 20, Figs. 1 and 3, until the eccentric disk Z) occupies a position substantially diametrically opposite from the position shown in Fig. 1, and when the tooth 19 engages the tooth b the shaft Z2 is rotated in a direction opposite to that indicated by arrow 20 and the eccentric disk brought into the position shown in Fig. 1, thus opening the electric circuit.

I do not in this application claim a circuitcontrolling device containing a circuit-reverser and a current-regulator having a regulating member, in combination with operating means for the circuit-reverser and currentregulator, by means of which, when the parts are moved to effect a change of polarity of the current, the movement of the regulating member is in' the same direction, as I have made this the subject-matter of another application, which I have filed, bearing Serial No. 419,625.

I claim 1. In an elevator mechanism, the combination of the following instrumentalities, viz: two worm-gears in mesh with each other, one of the said gears having its shaft provided with screw-threads, a worm-shaft having worms in engagement with the said wormgears, an electric motor, its armature, an independent coupling connecting the said armature-shaft directly to the worm-shaft, a resistance in circuit with the motor, a lever cooperating with said resistance, a shaft Z7 provided with an eccentric, a rack-bar connected to the said eccentric, a pinion in mesh with said rack-bar and to which the resistance-lever is connected, gearing to connect the screw-threaded worm-gear shaft with the shaft b, an electric brake mechanism, and a pole-changer in circuit with the motor and brake mechanism, substantially as described.

2. In an elevator mechanism, the combination of the following instrumentalities, viz: two worm-gears in mesh with each other, one of the said gears having its shaft provided with screw-threads, a worm-shaft having worms in engagement with the said wormgears, an electric motor, its armature, an independent coupling connecting the said armature-shaft directly to the worm-shaft, a resistance in circuit with the motor, a lever cooperating with said resistance, a shaft Z1 provided with an eccentric, a rack-bar connected to the said eccentric, a pinion in mesh with said rack-bar and to which the resistance-lever is connected, gearing to connect the screw-threaded worm-gear shaft with the shaft I), an electric brake mechanism consisting of a brake-wheel d, a brake-strap, a hub to which the said brake strap is connected, an electromagnet having its armature connected to said hub, and a pole-changer in circuit with the said electromagnet and motor, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN H. CLARK. lVitnesses:

J AS. H. CHURCHILL, EMMA J. BENNETT. 

